SEPARATOR PLATE AND ELECTROCHEMICAL CELL
A separator plate for an electrochemical system, comprising a first and a second metal layer arranged with flat sides adjacent to each other. The first and the second metal layer each having at least one through-opening for supplying and/or discharging a fluid. Circumferential edges of the through-openings are formed at least in part by a half-bead. An open edge of the half-bead is angled so as to form a collar.
The present application claims priority to German Utility Model Application No. 20 2021 104 496.9, entitled “SEPARATOR PLATE AND ELECTROCHEMICAL CELL”, and filed Aug. 20, 2021. The entire contents of the above-listed application is hereby incorporated by reference for all purposes.
TECHNICAL FIELDThe present disclosure relates to a separator plate comprising a first and a second metal layer, such as a separator plate for an electrochemical cell. The present disclosure also relates to an electrochemical system. Such electrochemical systems are, for example, redox flow batteries, electrochemical compressors, fuel cell systems or electrolyzers.
BACKGROUND AND SUMMARYIn fuel cell systems, for example, a plurality of such separator plates are stacked perpendicular to the layer plane of the separator plate. The individual separator plates are separated from one another by means of intermediate layers, for example membranes or membrane electrode assemblies (MEAs).
A membrane electrode assembly (MEA) usually comprises an electrochemically active region, in which proton transfer takes place between the two sides of the MEA and in which electrodes and catalytic coatings are present on the membrane surfaces; outside of the electrochemically active region, the MEAs are usually encircled by a reinforcement edge. In some embodiments, at least in the electrochemically active region, a gas diffusion layer is usually also present on every surface, which gas diffusion layer makes it easier for oxygen and hydrogen to reach the coated membrane.
For the sake of simplification, in relation to the separator plates, the terms electrochemically active region and electrochemically inactive region will be used below even when referring to the regions situated opposite these regions of the MEA.
In order to delimit fluid-guiding chambers from one another and from the outside, these separator plates have a plurality of beads, such as sealing beads, which seal off in a fluid-tight manner the fluid-guiding spaces between adjacent layers of a separator plate and between separator plates and adjacent MEAs. Sealing beads may have passages along their course, which passages in cross-section extend through the sealing bead from one side of the sealing bead to the opposite side of the sealing bead and serve to convey media, such as fluids, through or transversely to the sealing bead. The passages may extend, for example, in the form of at least one tunnel, which opens into a bead flank or like the latter is raised out of the layer plane, or in the form of at least one opening in the bead flank.
Furthermore, the circumferential edges of through-openings in the metal layers and/or also the outer circumferential edge of the metal layers are often cranked so as to form a half-bead. A stable edge is created in the often very thin metal layers.
When the stack of conventional separator plates is compressed, the metal layers of the separator plate bend at their edges, such as at the circumferential edges of the through-openings and at the outer circumferential edges. There is therefore a risk that the sharp, usually punched, outer rims of the through-edges or of the outer edges of the layers will press or dig into the intermediate layers that separate the separator plates, for instance the reinforcing edges of the MEA, and in some cases perforate these. The electrical insulation between the adjacent separator plates is then ruptured as a result, and thus the functioning of the electrochemical cell or of the electrochemical system is disrupted.
The object of the present disclosure is therefore to provide a separator plate in which damage to the adjacent layers is avoided even under compression.
This object is achieved by separator plates and systems described herein.
The separator plate according to the present disclosure for an electrochemical system comprises a first and a second metal layer (separator sub-plates) which are arranged with a respective one of their flat sides adjacent to each other. This first and this second metal layer each have at least one through-opening for supplying and/or discharging a fluid, said through-openings being arranged in pairs at least substantially coaxially with respect to their axial direction of passage and form a passage opening for the fluid to pass through the separator plate. The circumferential edges of the through-openings of a respective pair of through-openings form at least in part the circumferential edge of the respective through-opening and have at least in part or all the way round a half-bead that projects out of the layer plane of the respective metal layer in a direction away from the adjacent metal layer.
According to the present disclosure, the open edge of the half-bead of each of the metal layers is angled in the direction of the layer plane of the respective metal layer so as to form a collar. However, the collar need not be formed along the entire edge; it is also sufficient to form it along part of the edge. For the through-openings and/or for the outer circumferential edges, therefore, the collar of the first and the collar of the second metal layer may be arranged along at least part of the respective edge in an adjacent and overlapping manner.
In an alternative embodiment, the separator plate according to the present disclosure for an electrochemical system comprises a first and a second metal layer which are likewise arranged with a respective one of their flat sides adjacent to each other. In this case, the outer circumferential edge of the first metal layer and the outer circumferential edge of the second metal layer each have a half-bead which at least in part forms the respective circumferential edge and projects out of the layer plane of the respective metal layer in a direction away from the adjacent metal layer.
According to the present disclosure, the open edge of the half-bead of each of the metal layers is angled in the direction of the layer plane of the respective metal layer so as to form a collar.
For one, some or all of the through-openings and/or for the outer circumferential edges, for instance the collar of the first and/or the second metal layer along the circumferential edge of the through-opening and/or the outer circumferential edge may form at least in part the boundary of the fluid-guiding through-opening and/or of the outer circumferential edge.
The inventive design of the collar prevents the situation where, when the layers are compressed in a stack, despite the bending of the half-bead, free edges for example press against adjacent softer components, such as MEAs for example, for instance the reinforcing edges thereof, and damage them.
The inventive design of the edge of the metal can be applied to one, some or all of the through-openings or also to edges of the metal layers along the outer edge of the metal layers.
A sealing bead which extends around the respective through-opening may also be arranged on the side of the half-bead remote from the respective through-opening.
In contrast to these sealing beads, the aforementioned half-beads mainly have the function of setting the edge to a defined height and stabilizing the edge. An additional sealing function of the half-beads is not necessary, but is possible.
For one, some or all of the through-openings, the sealing beads may have along their course, at least in a first portion, at least one passage which in cross-section extends through the sealing bead from one side of the sealing bead to the opposite side of the sealing bead, wherein the collar is formed only in portions adjacent to the passage(s) and/or adjacent to the first portion. Adjacent is to be understood here to mean that, for instance, no collars are arranged in the regions in which the passages are present, but collars are arranged in the other regions adjacent to this first portion.
If, for example, one through-opening has passages over 55% of its circumferential edge, collars may be arranged in both layers over the remaining 45% or at least 40% of the circumferential edge.
The separator plate may enclose, between the first and the second metal layer, a cooling region for guiding a cooling medium along a flat side of the metal layers. In addition, channel structures for forming a flow field for a fluid may be arranged on the first and second metal layer, in each case on the flat side thereof remote from the adjacent metal layer.
The length, width and direction of the collars can be varied within wide limits, as long as the function of the two collars is fulfilled, namely that of preventing damage to a separating layer with respect to an adjacent separator plate. To this end, for example, the collar of the first and/or the second metal layer may project at least in part beyond the layer plane of the respective metal layer, or may extend at an angle. For example, for one, some or all of the through-openings and/or for the outer circumferential edges, the collar of the first and/or the second metal layer may extend substantially or entirely, such as over more than 50% of its length, for example in the case of one through-opening over more than 90% of its length outside of the first portion, at an angle β to the layer plane of the respective metal layer, where 70°≤β≤130°, or 80°≤β≤120°.
The same applies to the half-beads and their flanks. For instance, for one, some or all of the through-openings and/or for the outer circumferential edges, the flanks of the half-bead of the first and/or the second metal layer may extend substantially or entirely, such as over more than 50% of their length, for example in the case of one through-opening over more than 90% of their length outside of the first portion, at an angle α to the layer plane of the respective metal layer, where 20°≤α≤80°, or 25°≤α≤60°.
For one, some or all of the through-openings and/or for the outer circumferential edges, the collar of the respective metal layer may have one or more slots starting from the layer edge surrounding the through-opening or the outer circumferential edge in the first and/or second metal layer.
In the case of curved edges, this may compensate for the lack of material that occurs when the collar is bent out of the layer plane. Embodiments of slots which extend perpendicular to the layer edge might provide advantages, such as when they also extend to the layer edge. Due to the lack of material, for example in curved regions, slots that start perpendicular at the layer edge may also widen in their further extension, for example widen in a V-shaped manner. The slots may extend over the entire width of the respective collar. Furthermore, they may be arranged for instance in part equidistantly along the circumferential edge and thus can evenly reduce stresses in the collar that have built up during embossing.
For example, the ends of the collars of substantially coaxially arranged through-openings and/or of the outer circumferential edges of the first and the second metal layer overlap one another and/or are arranged offset from one another in a direction perpendicular to the layer plane of the first and/or the second layer. Even such an overlapping or an offset arrangement is sufficient to prevent damage to a separating layer between adjacent separator plates.
Furthermore, the collars of the first metal layer and the second metal layer need not be arranged relative to one another in a form-fitting manner, may need not be connected to one another in a form-fitting manner. This applies firstly to the collars of one passage opening, but may also apply jointly to all of the collars of the passage openings.
The present disclosure may also relate to electrochemical systems, such as redox flow batteries, electrochemical compressors, fuel cell systems or electrolyzers, comprising a plurality of separator plates according to the present disclosure, wherein the plurality of separator plates are stacked perpendicular to the layer plane of the first and/or to the layer plane of the second metal layer. In fuel cell systems, the MEAs are usually arranged in a manner alternating with the individual separator plates.
A few examples of separator plates according to the present disclosure will be given below. Identical or similar reference signs denote identical or similar elements, and therefore, where applicable, the description of these elements and reference signs will not be repeated. Each of the following examples implements a variety of optional features in addition to the mandatory features of the present disclosure. However, all the non-mandatory features not specified in the independent claims can also be combined, individually or in any combination, with other non-mandatory features of the same example or of one or more other examples.
It should be understood that the summary above is provided to introduce in simplified form a selection of concepts that are further described in the detailed description. It is not meant to identify key or essential features of the claimed subject matter, the scope of which is defined uniquely by the claims that follow the detailed description. Furthermore, the claimed subject matter is not limited to implementations that solve any disadvantages noted above or in any part of this disclosure.
Each MEA 10 contains at least one membrane, for example an electrolyte membrane. Furthermore, a gas diffusion layer (GDL) may be arranged on one or both surfaces of the MEA. Adjacent separator sub-plates, which are not separated from one another by an MEA, form a separator plate according to the present disclosure with the two separator sub-plates as a first and second metal layer, which separator plate separates two electrochemically active fields from one another.
In alternative embodiments, the system 1 may also be designed as an electrolyzer, as an electrochemical compressor or as a redox flow battery. Separator plates may likewise be used in these electrochemical systems. The structure of these separator plates may then correspond to the structure of the separator plates 2 explained in detail here, although the media guided on and/or through the separator plates in the case of an electrolyzer, an electrochemical compressor or a redox flow battery may differ in each case from the media used for a fuel cell system.
The z-axis 7, together with an x-axis 8 and a y-axis 9, spans a right-handed Cartesian coordinate system. The separator plates 2 each define a plate plane, wherein the plate planes of the separator plates or of the layers 2a, 2b thereof are each oriented parallel to the x-y plane and thus perpendicular to the stacking direction or to the z-axis 7. The end plate 4 usually has a plurality of media ports 5, via which media can be fed to the system 1 and via which media can be discharged from the system 1. Said media that can be fed to the system 1 and discharged from the system 1 may comprise for example fuels such as molecular hydrogen or methanol, reaction gases such as air or oxygen, reaction products such as water vapor or depleted fuels, or coolants such as water and/or glycol.
The bipolar plate 2 is formed of two separator sub-plates or layers 2a, 2b which are joined together in a materially bonded manner, of which in each case only the first separator sub-plate 2a facing towards the viewer is visible in
The separator sub-plates 2a, 2b typically have through-openings which are aligned with one another and form through-openings 11a-c of the separator plate 2. When a plurality of separator plates of the same type as the separator plate 2 are stacked, the through-openings 11a-c form lines which extend through the stack 6 in the stacking direction 7 (see
In order to seal off the through-openings 11a-c with respect to the interior of the stack 6 and with respect to the surrounding environment, the first separator sub-plates 2a each have sealing arrangements in the form of sealing beads 12a-c, which are respectively arranged around the through-openings 11a-c and in each case completely surround the through-openings 11a-c. On the rear side of the separator plates 2, facing away from the viewer of
In an electrochemically active region 18, the first separator sub-plates 2a have, on the front side thereof facing towards the viewer of
The sealing beads 12a-12c have passages 13a-13c, of which the passages 13a are formed both on the underside of the upper separator sub-plate 2a and on the upper side of the lower separator sub-plate 2b, while the passages 13b are formed in the upper separator sub-plate 2a and the passages 13c are formed in the lower separator sub-plate 2b. By way of example, the passages 13a enable coolant to pass between the through-opening 12a and the distribution or collection region 60, so that the coolant enters the distribution or collection region 60 between the separator plates 2a, 2b and is guided out therefrom.
Furthermore, the passages 13b enable hydrogen to pass between the through-opening 12b and the distribution or collection region on the upper side of the upper separator sub-plate 2a; these passages 13b are characterized by perforations facing towards the distribution or collection region and extending at an angle to the plate plane. By way of example, hydrogen thus flows through the passages 13b from the through-opening 12b to the distribution or collection region on the upper side of the upper separator sub-plate 2a, or in the opposite direction.
The passages 13c enable air, for example, to pass between the through-opening 12c and the distribution or collection region, so that air enters the distribution or collection region on the underside of the lower separator sub-plate 2b and is guided out therefrom. The associated perforations are not visible here.
The first separator sub-plates 2a each also have a further sealing arrangement in the form of a perimeter bead 12d, which extends around the flow field 17 of the active region 18 and also around the distribution or collection region 60 and the through-openings 11b, 11c and seals these off with respect to the through-opening 11a, that is to say with respect to the coolant circuit, and with respect to the environment surrounding the system 1. The second separator sub-plates 2b each comprise corresponding perimeter beads 12d. The structures of the active region 18, the distributing or collecting structures of the distribution or collection region 60 and the sealing beads 12a-d are each formed in one piece with the separator sub-plates 2a and are integrally formed in the separator sub-plates 2a, for example in an embossing, hydroforming or deep-drawing process. The same applies to the corresponding distributing structures and sealing beads of the second separator sub-plates 2b. Each sealing bead 12a-12d may have in cross-section at least one bead top and two bead flanks, but a substantially angular arrangement between these elements is not necessary; a curved transition may also be provided.
While the sealing beads 12a-12c take a substantially round course, the perimeter bead 12d has various portions of different shape. For instance, the course of the perimeter bead 12d may comprise at least two wavy portions.
The two through-openings 11b or the lines through the plate stack of the system 1 that are formed by the through-openings 11b are each fluidically connected to one another via passages 13b in the sealing beads 12b, via the distributing structures of the distribution or collection region 60 and via the flow field 17 in the active region 18 of the first separator sub-plates 2a facing towards the viewer of
In contrast, the through-openings 11a or the lines through the plate stack of the system 1 that are formed by the through-openings 11a are each fluidically connected to one another via a cavity 19 which is surrounded or enclosed by the separator sub-plates 2a, 2b. This cavity 19 serves in each case to guide a coolant through the separator plate 2, such as for cooling the electrochemically active region 18 of the separator plate 2. The coolant thus serves primarily to cool the electrochemically active region 18 of the separator plate 2. The coolant flows through the cavity 19 from an inlet opening 11a towards an outlet opening 11a. Mixtures of water and antifreeze are often used as coolants. However, other coolants are also conceivable. For guidance of the coolant or cooling medium, second structures are present on the inner side of the separator plate 2. Said second structures are not visible in
The separator plate according to the present disclosure comprises two metal layers, which correspond to directly adjacent separator sub-plates 2a and 2b of different separator plates in
The inventive design of edge regions around through-openings or at outer edges of separator plates will be presented below. With regard to the technical explanation, it is irrelevant whether the edge region is an edge region of through-openings or an outer edge region.
The individual metal layers are therefore denoted by reference signs 20a, 20b, 20c and 20d, wherein 20a and 20b form a separator plate according to the present disclosure and 20c and 20d form a separator plate according to the present disclosure. Sealing beads are denoted by reference signs 21a, 21b, 21c and 21d, the half-beads according to the present disclosure are denoted by reference signs 22a, 22b, 22c and 22d, the rims at the circumferential edge or outer edge are denoted by reference signs 23a, 23b, 23c and 23d, and the collars are denoted by reference signs 24a, 24b, 24c and 24d. In general, therefore, the metal layers are denoted by reference sign 20 in addition to reference signs 2a and 2b from
The collars 24a and 24b overlap as seen in the layer plane Ea, Eb of the layers 20a and 20b or of the MEA 10. This offset between the two collars 24a and 24b in the cross-section of the layers 20a and 20b is created by arranging the half-bead 22a with its bead foot closer to an adjacent sealing bead 21a than the half-bead 22b to an adjacent sealing bead 21b extending symmetrically to the sealing bead 21a. However, the bead top of the half-beads 22a and 22b is of equal length in the radial direction around the exterior 30.
The collar 24b, which extends into the interior space of the half-bead 20a and is radially further away from the region 30 than the collar 24a, is wider than the collar 24a in the example of
Embodiments of collars 24a and 24b each may have a width which ensures that their free ends overlap even in the compressed state, even when the half-beads gape open, in order to ensure a sufficient distance of the collar 24a from the MEA 10 even under compression. To this end, the collars 24a and 24b are wider in total than the distance between the bead tops of the half-beads 22a and 22b, for instance at least 20% wider. Furthermore, as a result of the collars 24a, 24b, the through-openings have defined outer walls at least over large portions along their course, which lead to low turbulence and thus low pressure losses of the media guided in the through-openings.
The collars 24a, 24b, 24c and 24d are schematically shown in
The edges of the layers 20c and 20d are also designed in a manner corresponding to the edges of the layers 20a and 20b.
Furthermore, the collars 24a and 24b do not extend at a right angle to the adjacent bead tops of the half-beads 22a and 22b in the respective same layer 20a and 20b, respectively, but instead extend at an enclosed angle between the bead top and the collar of more than 90°.
The preceding three embodiments each show half-beads and collars with sharp rims; this is a simplification for the sake of the drawing. In actual fact, all the rims are rounded or formed with a radius that is set during the shaping. Furthermore, all the exemplary embodiments are shown with a straight or flat bead roof; in actual fact, use can also be made of bead tops that are rounded or domed in cross-section.
For clarity, the MEA 10 below the layer 20a and above the layer 20b has not been shown. The design of the edges of the layers 20a and 20b around the opening 30 corresponds to that in
Embodiments of the collars (for example 24a, 24b, 24c and 24d) only have to be arranged along part of the circumferential edge of the through-opening or along part of the outer edge of the respective metal layer. In addition, it is possible that adjacent, mutually facing collars of adjacent layers only overlap in part.
It will be appreciated that the configurations and routines disclosed herein are exemplary in nature, and that these specific embodiments are not to be considered in a limiting sense, because numerous variations are possible. Moreover, unless explicitly stated to the contrary, the terms “first,” “second,” “third,” and the like are not intended to denote any order, position, quantity, or importance, but rather are used merely as labels to distinguish one element from another. The subject matter of the present disclosure includes all novel and non-obvious combinations and sub-combinations of the various systems and configurations, and other features, functions, and/or properties disclosed herein.
As used herein, the term “approximately” or “substantially” is construed to mean plus or minus five percent of the range unless otherwise specified.
The following claims particularly point out certain combinations and sub-combinations regarded as novel and non-obvious. These claims may refer to “an” element or “a first” element or the equivalent thereof. Such claims should be understood to include incorporation of one or more such elements, neither requiring nor excluding two or more such elements. Other combinations and sub-combinations of the disclosed features, functions, elements, and/or properties may be claimed through amendment of the present claims or through presentation of new claims in this or a related application. Such claims, whether broader, narrower, equal, or different in scope to the original claims, also are regarded as included within the subject matter of the present disclosure.
Claims
1. A separator plate for an electrochemical system, comprising:
- a first and a second metal layer which are arranged with a respective one of their flat sides adjacent to each other,
- wherein the first and the second metal layer each have at least one through-opening for supplying and/or discharging a fluid, said through-openings being arranged in pairs at least substantially coaxially with respect to their axial direction of passage and form a passage opening for the fluid to pass through the separator plate,
- wherein the circumferential edges of the through-openings of a respective pair of through-openings have a half-bead which at least in part forms the circumferential edge of the respective through-opening and projects out of the layer plane of the respective metal layer in a direction away from the adjacent metal layer,
- wherein the open edge of the half-bead of each of the metal layers is angled in the direction of the layer plane of the respective metal layer so as to form a collar.
2. The separator plate according to claim 1, wherein for at least one of the through-openings, a sealing bead which extends around the respective through-opening is arranged on the side of the half-bead remote from the respective through-opening.
3. The separator plate according to claim 2, wherein for at least one of the through-openings, the sealing bead has along its course, at least in a first portion, at least one passage which in cross-section extends through the sealing bead from one side of the sealing bead to the opposite side of the sealing bead, wherein the collar is formed only in portions adjacent to the passage and/or adjacent to the first portion.
4. The separator plate according to claim 1, wherein the outer circumferential edge of the first metal layer and the outer circumferential edge of the second metal layer each have a half-bead which at least in part forms the respective circumferential edge and projects out of the layer plane of the respective metal layer in a direction away from the adjacent metal layer, wherein the open edge of this half-bead of each of the metal layers is angled in the direction of the layer plane of the respective metal layer so as to form a collar.
5. The separator plate for an electrochemical system, comprising:
- a first and a second metal layer which are arranged with a respective one of their flat sides adjacent to each other,
- wherein the outer circumferential edge of the first metal layer and the outer circumferential edge of the second metal layer each have a half-bead which at least in part forms the respective circumferential edge and projects out of the layer plane of the respective metal layer in a direction away from the adjacent metal layer,
- wherein the open edge of the half-bead of each of the metal layers is angled in the direction of the layer plane of the respective metal layer so as to form a collar.
6. The separator plate according to claim 1, wherein the first and the second metal layer enclose between them a cooling region for guiding a cooling medium along a flat side of the metal layers.
7. The separator plate according to claim 1, wherein the first and the second metal layer each have, on the flat side thereof remote from the adjacent metal layer, channel structures for forming a flow field for a fluid.
8. The separator plate according to claim 1, wherein for at least one of the through-openings and/or for the outer circumferential edges, the collar of the first metal layer and the collar of the second metal layer are arranged along at least part of the respective circumferential edge in an adjacent and overlapping manner.
9. The separator plate according to claim 1, wherein for at least one of the through-openings and/or for the outer circumferential edges, the collar of the first and/or the second metal layer projects at least in part beyond the layer plane of the respective metal layer.
10. The separator plate according to claim 1, wherein for at least one of the through-openings and/or for the outer circumferential edges, the flank of the half-bead of the first and/or the second metal layer extends over more than 50% of its length outside of the first portion, at an angle α to the layer plane of the respective metal layer, where 20°≤α≤80°.
11. The separator plate according to claim 1, wherein for at least one of the through-openings and/or for the outer circumferential edges, the collar of the first and/or the second metal layer extends over more than 50% of its length, outside of the first portion, at an angle β to the layer plane of the respective metal layer, where 70°≤β≤130°.
12. The separator plate according to claim 1, wherein for at least one of the through-openings and/or for the outer circumferential edges, the collar of the first and/or the second metal layer along the circumferential edge of the through-opening and/or along the outer circumferential edge forms at least in part the boundary of the fluid-guiding through-opening and/or of the outer circumferential edge.
13. The separator plate according to claim 1, wherein for at least one of the through-openings and/or for the outer circumferential edges, the collar of the respective metal layer has one or more slots starting from the layer edge surrounding the through-opening or the outer circumferential edge in the first and/or second metal layer.
14. The separator plate according to claim 13, wherein for at least one of the through-openings and/or for the outer circumferential edges, the slots extend substantially perpendicular to the layer edge.
15. The separator plate according to claim 13, wherein for at least one of the through-openings and/or for the outer circumferential edges, the slots have a length that is less than or equal to the width of the respective collar.
16. The separator plate according to claim 13, wherein for at least one of the through-openings and/or for the outer circumferential edges, the slots are arranged along the circumferential edge.
17. The separator plate according to claim 1, wherein for at least one of the through-openings and/or for the outer circumferential edges, at least in part or all the way round, the ends of the collars of substantially coaxially arranged through-openings and/or of the outer circumferential edges of the first and the second metal layer overlap one another so as to form at least one overlap region and/or are arranged offset from one another in a direction perpendicular to the layer plane of the first and/or the second layer.
18. The separator plate according to claim 1, wherein for at least one of the through-openings and/or for the outer circumferential edges, the collars of the first metal layer and the second metal layer are not arranged relative to one another in a form-fitting manner.
19. The separator plate according to claim 1, wherein for through-openings arranged substantially coaxial to one another and/or for the outer circumferential edges, the flank of the half-bead of the first metal layer and the flank of the half-bead of the second metal layer are arranged at different positions perpendicular to the bead running direction, which extends along the respective circumferential edge of the through-opening and/or along the outer circumferential edge.
20. An electrochemical system comprising a plurality of separator plates claim 1, wherein the plurality of separator plates are stacked perpendicular to the layer plane of the first and/or to the layer plane of the second metal layer.
Type: Application
Filed: Aug 18, 2022
Publication Date: Feb 23, 2023
Inventors: Rainer GLUECK (Dornstadt-Tomerdingen), Thomas KINDER (Staig), Horst GEHRING (Orsenhausen), Thomas STOEHR (Laupheim)
Application Number: 17/820,842